System information

Utility Connector
VSBC-6 Reference Manual Reference – 33
Utility Connector
K
EYBOARD
/M
OUSE
I
NTERFACE
A standard PS/2 keyboard and mouse interface is accessible through connector J7. In addition,
connector J7 supports a programmable LED output, hard drive activity LED, and a speaker
output as shown in the table below. The pinout of the PS/2 connectors applies to use of the
VersaLogic transition cable #VL-CBL-1602.
Table 10: Utility Connector
J7
Pin
Signal
Name Description
PS/2
Pin
1 PBRST* Push-button reset
2 GND Ground
3 PLED* Programmable LED
4 MKPWR Protected +5V
5 SPKO* Speaker Output
6 MKPWR Protected +5V
7 IDE_LED* IDE Drive Indicator LED
8 MKPWR Protected +5V
9 MKPWR Protected +5V 4
10 XMSDATA Mouse Data 1
11 GND Ground 3
12 MSCLK Mouse Clock 5
13 MKPWR Protected +5V 4
14 KBDATA Keyboard Data 1
15 GND Ground 3
16 KBCLK Keyboard Clock 5
P
ROGRAMMABLE
LED
The Utility Connector J7 includes an output signal for attaching a software controlled LED.
Connect the cathode of the LED to J7 pin 3, connect the anode to +5V. An on-board resistor
limits the current to 15 mA when the circuit is turned on.
To turn the LED on and off, set or clear bit D7 in I/O port 0E0h (or 1E0h if selected in CMOS
Setup). When changing the register, make sure not to alter the value of the other bits.
The following code examples show how to turn on and off the LED. Refer to page 55 for further
information:
LED On LED Off
in al,E0h in al,E0h
or al,80h and al,7Fh
out E0h,al out E0,al
Note! The LED is turned on by the BIOS during system startup. This causes the light to
function as a "power on" indicator if it is not otherwise controlled by user code.
Mouse
Connector
Keyboard
Connector